Coating Acetylated Wood

Rowell, Roger M.; Bongers, Ferry

doi:10.3390/coatings5040792

Cited by 17 publications

(14 citation statements)

References 6 publications

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“…The energy absorbance is affected by the density and the chemical composition of wood. During UV exposure, the photo-oxidation mechanism in lignin leads to demethylation and the formation of quinones (Rowell -Bongers 2015, Jawaid et al 2017. As the lignin is degraded by UV light and washed away by rainwater, the surface cracks and the grey cellulose fibres become visible.…”

Section: Introductionmentioning

confidence: 99%

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Testing the Photostability of Acetylated and Boiled Linseed Oil-coated Common Hornbeam (Carpinus betulus L.) Wood

Fodor¹,

Németh²

2017

Acta Silvatica Et Lignaria Hungarica

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-In this study, the effect of acetylation and coating with boiled linseed oil was evaluated concerning the photodegradation of common hornbeam wood (Carpinus betulus L.). To measure colour stability, a 10-month-long outdoor weather resistance test without soil contact was performed as well as artificial aging using a 200 hour mercury-vapour lamp irradiation test. The measurements were done on hornbeam, acetylated hornbeam, boiled linseed oil-treated hornbeam, and acetylated and boiled linseed oil-treated hornbeam samples. The control and treated samples' colour change was determined by comparing them to the original colour in all cases. The photodegradation process was examined with Fourier Transform Infrared (FTIR) spectra. Acetylated hornbeam was less prone to crack, but the modification did not hinder the fading and greying caused by UV irradiation. Coating the samples with boiled linseed oil decreased the rate of colour change and cracking. The photodegradation of lignin was confirmed by the FTIR spectra.

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Section: Introductionmentioning

confidence: 99%

“…Feist et al (1991) found that acetylation only protects lignin to a small extent while protecting hemicellulose (xylan) to a greater extent during UV radiation. Acetylated wood exposed to weather or irradiation needs to be treated with dark, pigmented wood finish in order to stabilize its colour (Rowell -Bongers 2015).…”

Section: Introductionmentioning

confidence: 99%

Testing the Photostability of Acetylated and Boiled Linseed Oil-coated Common Hornbeam (Carpinus betulus L.) Wood

Fodor¹,

Németh²

2017

Acta Silvatica Et Lignaria Hungarica

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“…In addition, the exterior of modified wood (thermally modified, acetylated, etc.) quickly turns grey [47][48][49] due to the deposition of dirt and dust into its porous structure. This could be potentially prevented using hydrophobic self-cleaning coatings in combination with UV stabilization of the underlying wood.…”

Section: Introductionmentioning

confidence: 99%

“…For wood stabilization, it is possible to use protective pigments which are used as parts of coatings [25], as well as nanoparticles [32][33][34][35], UV stabilizers [36], and HALS applied in the penetration protective layer [37][38][39]. Changes in the colour of surface layers due to the weathering process [40] and the effects of microscopic fungi [41][42][43] are observed on wood [44,45] and on the protective coatings [46,47] on its exterior. In addition, the exterior of modified wood (thermally modified, acetylated, etc.)…”

Section: Introductionmentioning

confidence: 99%

Efficacy of Hydrophobic Coatings in Protecting Oak Wood Surfaces during Accelerated Weathering

et al. 2017

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Abstract:The durability of transparent coatings applied to an oak wood exterior is relatively low due to its anatomic structure and chemical composition. Enhancement of the protection of oak wood against weathering using transparent hydrophobic coatings is presented in this study. Oak wood surfaces were modified using UV-stabilizers, hindered amine light stabilizer (HALS), and ZnO and TiO 2 nanoparticles before the application of a commercial hydrophobic topcoat. A transparent oil-based coating was used as a control coating system. The artificial weathering test lasted 6 weeks and colour, gloss, and contact angle changes were regularly evaluated during this period. The changes in the microscopic structure were studied with confocal laser scanning microscopy. The results proved limited durability against weathering of both tested hydrophobic coatings. The formation of micro-cracks causing the leaching of degraded wood compounds and discolouration of oak wood were observed after 1 or 3 weeks of the weathering test. Until then, an oil-based coating film had protected the wood sufficiently, but after 6 weeks the wood was fully defoliated to its non-homogenous thickness, which was caused by the presence of large oak vessels, and by the effects of specific oak tannins. Using transparent hydrophobic coatings can prolong the service life of the exteriors of wood products by decreasing their moisture content. Without proper construction protection against rainwater, the hydrophobic coating itself cannot guarantee the preservation of the natural appearance of wood exteriors.

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“…The resulting effect in wood leads to its discoloration and a change in its chemical and mechanical properties. The change in wood color is the first sign of chemical alteration [3][4][5][6].…”

Section: Introductionmentioning

confidence: 99%

Effect of Adding UV Absorbers Embedded in Carbonate Calcium Templates Covered with Light Responsive Polymer into a Clear Wood Coating

et al. 2018

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Abstract:The limited durability of clear coatings is a major issue for the coating and wood industry. The addition of organic UV absorbers improves coating resistance by the absorption and the conversion of the UV radiation into harmless heat. Organic UVAs are prone to degradation and can migrate in the binder of coatings. In this study, commercial UVAs and HALS have been entrapped into CaCO 3 templates coated with stimuli responsive polymers. Microspheres were incorporated into a clear acrylic water-based coating formulation. The formulation was applied on glass and wood panels and was placed into an artificial UV chamber. This study presents a comparison between the aesthetic behavior of coating formulations with free and encapsulated commercial UVAs and HALS during the accelerated ageing test. Encapsulation of UVAs was confirmed by XPS and TGA analysis. Results have shown that the coating's aesthetic was slightly improved when using the encapsulated products.

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Coating Acetylated Wood

Cited by 17 publications

References 6 publications

Testing the Photostability of Acetylated and Boiled Linseed Oil-coated Common Hornbeam (Carpinus betulus L.) Wood

Testing the Photostability of Acetylated and Boiled Linseed Oil-coated Common Hornbeam (Carpinus betulus L.) Wood

Efficacy of Hydrophobic Coatings in Protecting Oak Wood Surfaces during Accelerated Weathering

Effect of Adding UV Absorbers Embedded in Carbonate Calcium Templates Covered with Light Responsive Polymer into a Clear Wood Coating

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